Figure out if your Mac is running a case sensitive filesystem.

case_sensitive.c

#include <stdio.h>
#include <unistd.h>

int main(void) {
    if (pathconf("/", _PC_CASE_SENSITIVE)) {
        printf("The file system is case sensitive\n");
    } else {
        printf("The file system is case insensitive\n");
    }
    
    return 0;
}